List of organisms by chromosome count

Karyotype of a human being, showing 22 pair of autosomal chromosomes and both the XX female and the XY male possibilities for the pair of sex chromosome

Fusion of ancestral chromosomes left distinctive remnants of telomeres, and a vestigial centromere. As other non-human extant hominidae have 48 chromosomes it is believed that the human chromosome 2 is the end result of the merging of two chromosomes.[1]

n=120–720 with a high degree of polyploidization[11] n=720 in hexaploid species O. reticulatum. A google book search for "ophioglossum reticulatum chromosomes" returns values of 2n=768 and 2n=1260, though these sources may be wp:circular and unreliable.

^Contreras LC, Torres-Mura JC, Spotorno AE (1990). "The largest known chromosome number for a mammal, in a South American desert rodent". Experientia. 46 (5): 506–508. doi:10.1007/BF01954248. PMID2347403.

Bell, G. (1982). The Masterpiece of Nature: The Evolution and Genetics of Sexuality (University of California Press, Berkeley), p. 450, [4] (table with a compilation of haploid chromosome number of many algae and protozoa, in column "HAP").